import dagster as dg
from dagster_snowflake import SnowflakeResource
from src.utils.snowflake.constants import Warehouse
from src.utils.snowflake.query import load_query
from src.utils.snowflake.partition_utils import parse_hourly_partition_key

@dg.asset_check(
    asset="rds_generated_lyrics",
    description="Verify ID uniqueness in partition",
    blocking=False
)
def check_generated_lyrics_id_uniqueness(
    context: dg.AssetCheckExecutionContext,
    snowflake: SnowflakeResource
) -> dg.AssetCheckResult:
    """Check that all IDs in the partition are unique."""
    partition_key = context.op_execution_context.partition_key
    p_date, p_hour = parse_hourly_partition_key(partition_key)
    
    with snowflake.get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute(load_query(
            "src/utils/snowflake/queries/use_warehouse.sql",
            params={"warehouse": Warehouse.SUNO_PROD_RDS_HOURLY_MEDUIM.value}
        ))
        
        cursor.execute(f"""
            SELECT COUNT(*), COUNT(DISTINCT ID), COUNT(*) - COUNT(DISTINCT ID)
            FROM SUNO_PROD.PROD.RDS_GENERATED_LYRICS
            WHERE p_date = '{p_date}' AND p_hour = {p_hour}
        """)
        
        total, distinct, dupes = cursor.fetchone() or (0, 0, 0)
        
    passed = dupes == 0
    return dg.AssetCheckResult(
        passed=passed,
        description=f"{'All IDs unique' if passed else f'{dupes} duplicate IDs found'}",
        metadata={
            "total_rows": total,
            "distinct_ids": distinct,
            "duplicates": dupes
        }
    )


@dg.asset_check(
    asset="rds_generated_lyrics",
    description="Verify row count > 0",
    blocking=False
)
def check_generated_lyrics_row_count(
    context: dg.AssetCheckExecutionContext,
    snowflake: SnowflakeResource
) -> dg.AssetCheckResult:
    """Check that the partition has data (row count > 0)."""
    partition_key = context.op_execution_context.partition_key
    p_date, p_hour = parse_hourly_partition_key(partition_key)
    
    with snowflake.get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute(load_query(
            "src/utils/snowflake/queries/use_warehouse.sql",
            params={"warehouse": Warehouse.SUNO_PROD_RDS_HOURLY_MEDUIM.value}
        ))
        
        cursor.execute(f"""
            SELECT COUNT(*)
            FROM SUNO_PROD.PROD.RDS_GENERATED_LYRICS
            WHERE p_date = '{p_date}' AND p_hour = {p_hour}
        """)
        
        row_count = cursor.fetchone()[0]
    
    passed = row_count > 0
    return dg.AssetCheckResult(
        passed=passed,
        description=f"Partition has {row_count} rows (expected > 0)",
        metadata={"row_count": row_count}
    )


asset_checks = [
    check_generated_lyrics_id_uniqueness,
    check_generated_lyrics_row_count
]

__all__ = ["asset_checks"]